Package stackaddrs builds on the top-level "addrs" package to provide the addresses for the extra layer of concepts that the stacks configuration language and its runtime are concerned about.

Package stackconfig deals with decoding and some static validation of the Terraform Stack language, which uses files with the suffixes .tfstack.hcl and .tfstack.json to describe a set of components to be planned and applied together.

Package stackplan contains the models and some business logic for stack-wide "meta-plans", which in practice are equivalent to multiple of what we traditionally think of as a "plan" in the non-stacks Terraform workflow, typically represented as a [plans.Plan] object.

Package stackruntime contains the runtime implementation of the Stacks language, allowing the various operations over a stack configuration and its associated state and plans.